MIC38C45-1BM-TR [Microchip]

The MIC38C4x are fixed-frequency, high performance, current-mode PWM controllers. Microchip’s BiCMOS devices are pin compatible with 384x bipolar devices, but feature several improvements. Undervoltage lockout circuitry allows the ‘42 and ‘44 versions to start up at 14.5V and operate down to 9V, and the ‘43 and ‘45 versions start at 8.4V with operation down to 7.6V. All versions operate up to 20V. Compared to bipolar 384x devices, start-up current has been reduced to 50μA typical and operating current to 4.0mA typical. Decreased output rise and fall times drive larger MOSFETs, and rail-to-rail output capability increases efficiency, especially at lower supply voltages. The MIC38C4x also features a trimmed oscillator discharge current and bandgap reference.